package org.nnsoft.guice.rocoto.variables;

/*
 *    Copyright 2009-2012 The 99 Software Foundation
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

import java.util.Map;

/**
 * Resolve what should be resolved against a configuration.
 */
public interface Resolver
{

    /**
     * @param data
     * @return Resolved value
     */
    String resolve( Map<String, String> data );

    /**
     * @return False if it's not worth to call {@link #resolve(Map)}.
     */
    boolean needsResolving();

}
